package cn.xzp.c05052;

class Book{
	boolean checkedOut=false;
	Book(boolean checkOut){
		checkedOut=checkOut;
	}
	void checkIn(){
		checkedOut=false;
	}
	protected void finalize(){
		if(checkedOut){
			System.out.println("Error:checked out");
		}
	}
}
public class TerminationCondition {
	public static void main(String[] args) {
		Book novel =new Book(true);
		novel.checkIn();
		new Book(true);
		System.gc();
	}
}
